Project Launching, Symposium and Tecnical Meeting

9-12 June, Gyeongju City, Korea (M2)

SHALE HYDROCARBON POTENTIAL IN THE SOUTH SUMATRA BASIN

CCOP – KIGAM Unconventional Oil and Gas Project: Mapping of Black Shale Formation for the Prediction of Shale Resources (UnCon Project)

OUTLINE

BACKGROUND and AIMS

GEOLOGICAL SETTING

1

2

3

RESULTS 5

4

CONCLUSIONS

6

DATA

RESEARCH METHOD

Background

Geological Agency, 2011

Indonesia that has a long history for an oil&gas

producing country, is predicted to have abundant of

Shale Hydrocarbon (HC) that spread out in some

mature basins (i.e: The South Sumatra Basin).

Indonesia is facing energy crisis, and Shale HC is one of

the promising alternative fuel energy resources to be an

important facet of the nation’s energy.

In the near future, Lemigas will conduct a pilot project

of shale HC in order to prove their potential reserves

in a commercial basis.

Theoretically, a mature

basin may produces both

of conventional and

unconventional oil&gas.

AIMS of The Reseach

To characterize and maps shale HC plays in the

South Sumatra Basin.

To calculate natural resources of shale HC

within the high graded areas.

Regional Structures and Stratigraphy The Tertiary half-grabens and major faults

of the SSB Province are oriented NW-SE

and NE-SW.

Numerous depocenter bounded by major

faults.

Lahat/ Lemat lacustrine shales and

Talangakar shallow marine and deltaic

coaly shales are the mature source rocks.

The province contains the Lahat, Lemat

and Tertiary petroleum systems.

Oil and gas are produced from the

onshore South Sumatra Basin Province.

Shale from Lahat and Talangakar

Formations were widely accepted as

general source rocks within the province.

Lemat and Talangakar Source Rock

Reservoir, therefore, are the main targets. (Bishop, 2001)

Data Availability Distribution of well and seismic data • Seismic quality : poor – medium (seismic data

is dominated by vectorization seismic data)

• Well Log data has no S-wave sonic

• Geochemical information is limited

Jelapang-1

Kemang-1 Tepus

Singa-1

Lab. Analysis results of surface data (not all surface data reflects the sub-surface character)

PT-3 well shows the Lahat Formation at 2125 mMD with

TOC ranging 5-6%, S1 = 1.69, S2 = 42.19, Tmax = 4410C, Ro

= 0.7, and HI = 200 – 750 (Yuliandri et al., 2013)

Research Method

7

Data

- Well

- Seismic

- etc

Work flow of Sweet spot Identification

Unfortunately, this

workflow was unable to

follow

Seismic attributes were

not exercised in this study

due to limited data

condition.

Maps of Brittleness Index

and TOC can not be

produced due to not

enough supporting data.

Static Model

Results Shale HC Play

Sweet Spot Area

Shale HC Resources

8

Sequence Stratigraphy Correlatiom

Schematic of chronostratigraphy of

some wells

NW SE

4.5 km

SINGA-1

Kemang-1

SB-1 eq. Top Basement

SB-2 eq. Top Lemat/lahat Fm.

SB-3 eq. Top TAF

Jelapang-1

Jelapang-1

Kemang-1

Singa-1

Tepus

Kemang-1

Singa-1

Tepus

Jelapang-1

Kemang-1

Singa-1

Tepus

Marine shale

Deltaic/Lacustrine

Fluvial

Paleogeography map of Upper TAF

Paleogeography map of Lemat/Lahat Fm.

Time structure of Basement

Deep Area (estimated as

Source Rock Reservoir)

Source of paleogeography maps:

Ginger-Fielding, 2005

TOC Prediction by using

Passey’s method (1990)

∆𝑙𝑜𝑔𝑅 = 𝑙𝑜𝑔10

𝑅

𝑅𝑏𝑎𝑠𝑒𝑙𝑖𝑛𝑒+ 0.02𝑥 ∆𝑡 − ∆𝑡𝑏𝑎𝑠𝑒𝑙𝑖𝑛𝑒

𝑇𝑂𝐶 = ∆𝑙𝑜𝑔𝑅 𝑥10(2.297−0.1688𝑋𝐿𝑂𝑀)

LOM=9

LOM=10

LOM=11

KPG-1

KPG-1 WELL

Sweetness

Spectral decon

Singa-1 well has no complete log

SINGA-1

Maturity Modeling

14

Top Oil Window is

ranging from 2000 –

2500 m depths

Peak Oil Window is in

the range of 2500 –

3200 m depth.

Gas Generation

Window is deeper than

3200 m depth.

Suggesting the Lemat

and Talangakar SRR

maybe mature enough

to generate oil and gas.

TOP BASEMENT

SB 1.1

SB 4

SB 6

Mendarai-1Talang Gendum-1 Tasim-1

N S

Jelapang-1 Rukam-1 Gajah Besar-1

B T

SB 8

MATURITY MODELING

Present Day ( 0 Ma)

GEOCHEMISTRY ANALYSIS (From Well)

No sample data for Validation

Need the fix method for getting the good solution

PETROPHYSICAL

Petrophysical summary of the Lahat Formation parameters at depth

2125 - 2175 mMD (PT-3) are: Porosity = 3 %, Sw = 0.88 %, and

kerogen density = 2.62 gr/cm³ (Yuliandri et al., 2013)

The Surrounding Area of

- Jelapang well

- Kemang well

- Singa well

- Tepus well

Calculating Method

Identify and Calculate

Natural Resource of Sweet Spot Area

Generally,

Sequence-1 = SB-1 – SB-1.1

Sequence-2 = SB-1.1 – SB-2

Sequence-3 = SB-2 – SB-3

Result: there are 9 maps :

For example (2 maps)

Lewis et al.(2010)

Downey et al. (2011)

Jarvie et al.(2004) Absorbed Gas

Free Gas

Oil

Conclusion

South Sumatra Basin could be a very viable

energy resource in the near future for

Indonesia.

Both Lemat and Talangakar plays have good

Shale HC potential, suggesting these primarily

results to promise further Shale HC

exploration in South Sumatra Basin.

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